Jig saw



April 5, 1932. F. E. SCHNEIDER JIG SAW 1 Filed Aug. 21, 1951 3 sheets sheet l nventor f1 llomey April 5, 1932- F7 E. SCHNEIDER ,852, 93

JIG SAW Filed Aug. 21. 1951 {Sheets-Sheet 3 Inventor Attorney 1 k ESc/meider Patented Apr. 5, 1932 FRANK E. SCHNEIDER, OF OSWEGO, NEW YORK JIG SAW Application filed August 21, 1931. Serial at. 558,610. a

This invention relates to'a jig saw, the general object of the invention being to provide a saw having upper and lower plungers vertically arranged with jaws on the adjacent ends of the plungers for receiving the ends of a saw blade and means for reciprocating the lower plunger thus actuating the saw blade, the upper end of which'is guided by the upper plunger.

Another object of the invention is to make the connecting rod between the lower plunger and the drive means of considerable length and of light weight so as to transmit the power of the drive means very efliciently and wear of the plunger and bearings is greatly reduced.

Another object of the invention is to provide a pump which is operated by the upper plunger for producing an air blast which reb moves sawdust from the line being followed by the saw.

A still further object of the invention is to make the work table adjustable from a horizontal position to various inclined posi- 5 tions and also to provide means whereby the blade can be turned very easily and quickly. This invention also consists in certain other features of construction and in the combinai tion and arrangement of the several parts, to

be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying draw ings wherein like characters denote likeor corresponding parts throughout the several views, and in which:

Figure 1 is an elevation'ot the improved edge. V

Figure 2a is a sectional view through the upper portion thereof and showing the plunger and its associated parts withaporframe of the machine having a hose and the 56 lower tront'part of which is'formedwith the tubular portion 1 which received the"bearings 2 for the driveshaft 3 which may be driven trom'the motor M or any other power device by means of a belt passing over a pulley 4L fastened to the shaft; A crank disk 5 is connected to one end of the shaft and a long connecting rod 6 is eccentrically connected with the disk by the crank pin 7.

The disk is provided with a number of threaded holes 5 for receiving the pin? so that the stroke or" the plungers may be readily changed. Anti-friction bearing means 8 are provided for the connecting rod 6. I pre for to split the lower end of the connecting rod as shown at 9 and pass a screw 10 throughv the split portion to properly confine the antifriction bearing within the recess formed in the lower end of theconnecting rod.

A wrist pin 11 passes through a bushing 12 in the upper end of the connecting rod and engages a threaded hole in a member 13 which has an opening therein for receiving the lower plunger 14, the member 13 being split and screw 15 clamps the split portion on the plunger and by releasing this screw 15, 7 the plunger can be easily and quickly. turned in the memben The plunger passes through the bushings 16 located in the tubular part 17 of the frame and packing means 18 is located between the adjacent ends of the bushings. .A lubricant cup 19. is connected with-the part1? for sup plying lubricant to the packing means 18. The threaded shank19 of a stationary jaw 20 is threaded in the upper end of the plunger, this awbeing of substantialangle shape so as to provide a space for the movable jaw 21,. this jaw 21 being caused to clamp the end of the saw blade placed between the jaws by the thumb screw 22 which passes through the stationary jaw 20 into the jaw 21 when using the wider blades B; the notches therein fit over the thumb screws 22 and 31. v

A lubricant cup 23 supplies lubricant to the,

- shaft 3. I prefer tou'se'aluminum in the construction of the rod 6. The upper plunger 24 passes through the bushings 25v located in -the tubular part 26 of. the frameand packing means 27 are located between the adjacent ends of the bushing and is supplied with lume fie the quadrant and into a long nut 37 which projects beyond the table so as to facilitate securely fastening the table in the desired position. A hold downrod 38 having a head 39 at its lower end is slidably arranged in the boss 40 which is cast in the frame and is held in adjusted position by the thumb screw 41.

A cylinder 42 is connected with the upper end of the top bushing 25 by a screw 43 and a piston 44 is located in the cylinder and is connected with the upper end of the plunger 24 so that the piston will move with the:

plunger. This cylinder and piston-actsas an air pump for forcing air through the tube 45 7 loosen or tighten the thumb screws 22 and 31.

so that the air escaping from the tube will remove dust from the table and the work placed thereon.

I It will of course be understood that the blade is held by the upper and lower sets of jaws with part of the blade passing through the hole 33 in the table and by loosening the screw 15, the lower plunger can be turned to set the blade as desired, it being understood that the movement of the blade will move the upper plunger and that the reeiprocatory movement of the blade and lower plunger is communicated to the upper plunger by the blade. This spring 46 will be compressed when plunger is down and lifts up the plun er on the up stroke thus keeping the blade properly tensioned. Provision is made for changing tension of spring byscrew piston down on plunger. The plungers are made of very light material such as aluminum alloy and by having the stroke vertical the use of doublefedge blades may be very successfully used. The jaws are I so formed that the blades can be easily and quickly changed, as is simply necessary to When necessary the coil spring 46 may be placed on the upper plunger below the piston which will act to lift the upper plungerwhen very fine blades are used. This willpermit the work being sawed to be drilled and placed over the saw blade after which'it is only necessary to bring down the upper plunger and refasten the saw blade thereto by the upper to direct the air. to diiferent parts of the work on the table byremoving the screw 43 for the anti-friction means.

1 of the connecting rod 6, which is very effective asthe arrangement showsforms a grease seal The screw 7 holds the inner race against the crank disk 5 with but slight clearance and-properly alines the ballbearings. By loosening the screw 15, the plunger 14 is released from theclamping member 13 so that the plunger can be partly rotated for changing the set of the saw blade or the plunger can be removed and substituted by a new one formed with a chuck for receiving a different kind of tool from a saw blade. Of course if desired the jaws can be removed from the plungers and chucks substituted therefor. By providing a number of holes 5 in the disk 5, the length of stroke of the plunger can be easily and quickly changed. The type of jaws used enables all kinds of saw blades to be used with the device. As will be seen each of the jaw members 20 and 29 has a projection 20 at one'of its free corners receivable in a recess in the companion jaw members. These projections form stops to engage upper and lower parts of the blade to insure the blade being in perfect vertical alignment before clamping the blade in posi tion by tightening the thumb screws. As before stated when the notched blade shown at B in Figure 3 is used the notches therein fit over the thumb screws. This construction of the jaw members permits instant changing of the blades. The holddevice 38 can be easily and quickly adjusted to prevent the work from raising from the table when the saw is tion and arrangement of the several parts pro vided that such changes fall'within the scope of the appended claims. c

Having thus described my invention, what I claim as new is 1. A device of the class described comprising a frame, upper and lower plungers mounted for reciprocatory movement in the frame, said plungers being in alinement with i I "each other, two engaging members connected with the adjacent ends ofthe plungers, a drive shaft journalled in the frame, a clamp justed position to the plunger, and means connected to said member for reciprocating the plunger to which it is attached.

3. A device of the class described comprising a frame, upper and lower plungers mounted for reciprocatory movement in the frame, said plungers being in alinement with each other, a member having one of its ends split and formed with an opening for receiving a part of one of the plungers, and a clamping screw passing through the split end for clamping the member to the plunger, a pitman rotatably connected to the other end of said member, a drive shaft, means for connecting the other end of the pitman to the drive shaft to reciprocate the plunger, and, means for detachably connecting the ends of a tool to the adjacent ends of the plungers.

In testimony whereof I aflix my signature.

FRANK E. SCHNEIDER. 

